I just got caught in a bad place. I installed a new GTX-1080ti a couple of weeks ago and I'm very pleased with it. It's multiple times faster than the flashed GTX-680 that it replaced. Today, I saw a new update on the Apple store, so I decided to update. I should have thought about it a little longer before I did that. After the update, macOS reverted to the native macOS video drivers, as there are no compatible nVidia drivers for the current build. This resulted in a non-working 1080 card. Fortunately, I still have the 680. I don't have room in my 5.1 to run both cards, so I had to physically remove the 1080 and re-install the 680. Looks like I will have to run the 680 until a new driver is released by nVidia. Two questions: 1) This seems like a chicken/egg problem for non-flashed nVidia cards. Even if a new nVidia driver is available, I can't install an nVidia update until I've installed a new macOS update. So, if I don't have the 1080 flashed, I will always have to swap cards whenever I want to update macOS to the latest build. Is that a true assumption? 2) I flashed my 680 when I first bought it. It was an easy process. I'm not keen on shipping my new 1080 card and having to wait for it to get back. I can't imagine it's rocket science. Is there a way for me to flash it myself? I don't mind paying a license fee to whomever developed the new bios code. I'm a bit peeved that I've got to pay UPS shipping + labor on top of the license fee on top of buying the card in the first place.